One place called this is 
One place called this is a red light district on the right bank of the Elbe. The Vila Olimpia is an upscale district of another city called this, which also features the cable-stayed Octavio Frias de Oliveira Bridge over the Pinheiros River. The Pinheiros flows into the Tietê just downstream of the bridge, and though this place is only about 20 kilometers from the coast, the Tietê flows west, where it eventually meets the Pirana. The Edificio Copan, located in that same city, is the largest residential building by square footage in the world and was designed by Oscar Niemeyer. Pig's Eye Lake is an artificial body of water in another place called this, which also features the Fitzgerald Theater and a Cass Gilbert-designed state capitol building. For ten points, what is this place name, one of which is located at the confluence of the Minnesota and Mississippi Rivers and another of which is the largest city in Brazil?
One place called this is a red light district on the right bank of the Elbe.
{St. Paul} (accept {Sao Paulo})